sar command lets you see performance statistics for different elements of your Linux computer, for both real-time and historical data. We show you how to use this great resource.
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sar command, or System Activity Reporter, is part of the
sysstat package. It captures a set of statistical information such as CPU load, memory paging, memory utilization, swap usage, network I/O, and much more. It makes this data accessible to you in real-time snapshots—showing you what’s happening on your computer right now—and in historical reports.